condition mean min max ZT0-3 22.0715 22.0715 22.0715 ZT4-7 18.32335 18.32335 18.32335 ZT8-11 19.32345 19.32345 19.32345 ZT12-15 17.8918 17.8918 17.8918 ZT16-19 23.88065 23.88065 23.88065 ZT20-23 23.6007 23.6007 23.6007